WebKitGTK UAF via improper memory handling in WebKitGTK
CVE-2026-78376 Published on August 24, 2026

Webkitgtk: use-after-free of jscvalue function parameters
A flaw was found in WebKitGTK. Processing malicious web content can cause a use-after-free issue due to improper memory handling and result in memory corruption.

Vendor Advisory Vendor Advisory NVD

Vulnerability Analysis

CVE-2026-78376 is exploitable with network access, requires user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be very high.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
REQUIRED
Scope:
UNCHANGED
Confidentiality Impact:
HIGH
Integrity Impact:
HIGH
Availability Impact:
HIGH

Timeline

Reported to Red Hat.

Made public.

Weakness Type

What is a Dangling pointer Vulnerability?

Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code.

CVE-2026-78376 has been classified to as a Dangling pointer vulnerability or weakness.


Products Associated with CVE-2026-78376

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Red Hat Enterprise Linux (RHEL)
 

Affected Versions

WebKit: WebKitGTK: Red Hat Enterprise Linux 8: Red Hat Enterprise Linux 9: Red Hat Enterprise Linux 6: Red Hat Enterprise Linux 7: Red Hat Enterprise Linux 7: